From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: missing ipi_spec_dst in struct in_pktinfo
Date: Sat, 05 Sep 2009 16:12:00 -0000 [thread overview]
Message-ID: <20090905161229.GA1869@calimero.vinschen.de> (raw)
In-Reply-To: <OF10653B86.82265559-ON85257627.006D9ED5-85257627.006ED0E7@epamail.epa.gov>
On Sep 4 16:10, Schulman.Andrew@epamail.epa.gov wrote:
>
> I'm trying to build socat for Cygwin (1.7). The build fails with
>
> xio-ip.c:480: error: structure has no member named `ipi_spec_dst'
>
> The offending code wants to use pktinfo->ipi_spec_dst.s_addr, where
> pktinfo is a struct in_pktinfo *. The problem is that in Cygwin,
> in_pktinfo doesn't have an ipi_spec_dst member. The IP man page
> (http://homepages.cwi.nl/~aeb/linux/man2html/man7/ip.7.html) lists
> in_pktinfo as
>
> struct in_pktinfo {
> unsigned int ipi_ifindex; /* Interface index */
> struct in_addr ipi_spec_dst; /* Local address */
> struct in_addr ipi_addr; /* Header Destination address */
> };
>
> while in /usr/include/cygwin/in.h, it's just
>
> struct in_pktinfo
> {
> struct in_addr ipi_addr;
> uint32_t ipi_ifindex;
> };
>
> Any suggestions for a workaround to this problem? Why is ipi_spec_dst
> missing, and more to the point, what can/should I substitute in its
> place?
ipi_spec_dst is missing because the Winsock structure in_pktinfo is
defined without this field. The recvmsg function will return the
Winsock equivalent to this structure, since that's how it gets it from
Windows. The workaround is easy: Don't use that field. Disable the code
in socat which uses it. Even if we would go to great lengths to
add/remove the field when calling WSASendMsg/WSARecvMsg, it would be
entirely meaningless anyway.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat
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next prev parent reply other threads:[~2009-09-05 16:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-04 20:10 Schulman.Andrew
2009-09-04 21:09 ` Christopher Faylor
2009-09-05 16:12 ` Corinna Vinschen [this message]
2009-09-08 14:38 ` Andrew Schulman
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